HV9982DB1 Supertex, HV9982DB1 Datasheet

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HV9982DB1

Manufacturer Part Number
HV9982DB1
Description
Manufacturer
Supertex
Datasheet
1.HV9982DB1.pdf (11 pages)

Specifications of HV9982DB1

Lead Free Status / Rohs Status
Supplier Unconfirmed
General Description
The HV9982DB1 is a three channel boost LED driver
demoboard using Supertex’s HV9982 LED Driver IC. The
LED driver can be used to drive RGB or multi channel white
LEDs from a 24V input. The LED string current can be
adjusted up to a maximum of 100mA. The demoboard has
good current matching between strings and an excellent
PWM dimming response, making it ideal for LED backlight
applications.
The HV9982DB1 uses the HV9982 LED driver IC to drive
three discontinuous conduction mode boost converters
at a 500kHz switching frequency. The clocks of the three
channels are phase shifted to provide ripple cancellation at
the input and thus reducing the input capacitor requirements.
The output current level can be adjusted using an external
voltage source at the REF terminal.
The HV9982DB1 includes hiccup mode protection for both
short circuit and open circuit conditions to ensure that it
recovers from a momentary fault condition. It also enables
the board to survive prolonged fault conditions without any
damage to both the driver as well as the LEDs.
The HV9982DB1 also includes an on-board PWM generator
for analog control for PWM dimming (for backward
compatibility with CCFL controllers). This feature enables
the user to PWM dim the driver with a 0-2V analog signal
input and helps to achieve zero LED current with an analog
dimming input
Connection Diagram
Three Channel LED Driver Demoboard
+
-
0 - 0.5V
DC source
24V DC source
- +
6MHz clock
(TTL compatible)
Specifi cations
Parameter
Input voltage
LED string voltage (all channels)
LED current (all channels)
Switching frequency of the
converter at F
External frequency at CLK pin
Current matching between
channels
Typical full load effi ciency
PWM dimming
rise and fall times
PWM dimming frequency
(for analog control of PWM
dimming)
Shutdown mode current
Typical I
(for all three channels)
Open LED drotection
Output short circuit protection
Hiccup time
DD
current
CLK
= 6.0MHz
Included; hiccup-mode
Included; hiccup-mode
HV9982DB1
12mA (V
100mA (max)
480Hz (typ)
24V ± 10%
35V – 80V
1ms (typ)
≤ 600μA
DD
500kHz
≤ ± 3%
Value
6MHz
= 8V)
≤1μs
90%

HV9982DB1 Summary of contents

Page 1

... PWM dimming response, making it ideal for LED backlight applications. The HV9982DB1 uses the HV9982 LED driver IC to drive three discontinuous conduction mode boost converters at a 500kHz switching frequency. The clocks of the three channels are phase shifted to provide ripple cancellation at the input and thus reducing the input capacitor requirements ...

Page 2

... Table 1 : Truth Table for S1 and PWMD Output LO LO The output will follow PWMD input signal Input DC zero volt corresponds to 100% duty cycle output HI HI Input DC two volt corresponds to 100% duty cycle output 2 HV9982DB1 ...

Page 3

... Once the LED string is reconnected, all three channels will turn back on. Short Circuit Protection – Short the output terminals of any one channel using a jumper. All three channels shut down and the IC tries restarting every 1.0ms. Once the short circuit is removed, all three channels come back into regulation. 3 HV9982DB1 ...

Page 4

... C4 (Green): Output Current for Channel 1 (100mA/div) Time Scale: 1μs/div C2 (Pink): RAMP waveform (2V/div) C1 (Yellow): Input Voltage (10V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 500μs/div C1 (Yellow): Output Voltage of Channel 1(20V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 20μs/div 4 HV9982DB1 ...

Page 5

... C1 (Yellow): Output Voltage of Channel 1(20V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 20ms/div C1 (Yellow): Output Voltage of Channel 1(20V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 20mA/div C1 (Yellow): Output Voltage of Channel 1(20V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 500μs/div 5 HV9982DB1 ...

Page 6

... C4 (Green): Output Current for Channel 1 (200mA/div) Ma (Orange): LED String Voltage of Channel 1(20V/div) Time Scale: 200ns/div C1 (Yellow): Output Voltage of Channel 1(20V/div) C4 (Green): Output Current for Channel 1 (200mA/div) Time Scale: 1ms/div C1 (Yellow): Output Voltage of Channel 1(20V/div) C4 (Green): Output Current for Channel 1 (200mA/div) Time Scale: 500μs/div 6 HV9982DB1 ...

Page 7

... Output Current for Channel 1 (50mA/div) Time Scale: 500μs/div C1 (Yellow): PWM Dimming Input for Channel 1(5V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 1μs/div C1 (Yellow): PWM Dimming Input for Channel 1(5V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 1μs/div 7 HV9982DB1 ...

Page 8

... RAMP voltage (2V/div) C1 (Yellow): External SYNC signal (5V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 1ms/div C2 (Pink): Signal at PWMD1 terminal (2V/div) C3 (Blue): RAMP voltage (2V/div) C1 (Yellow): External SYNC signal (5V/div) C4 (Green): Output Current for Channel 1 (50mA/div) Time Scale: 1ms/div 8 HV9982DB1 ...

Page 9

... Fig. 17: Analog Control of PWM Dimming - Measurements 120 100 -20 Circuit Schematic - Part Output Current vs. PWMD Voltage 0.5 1 PWMD Voltage (V) HV9982 9 HV9982DB1 1.5 2 ...

Page 10

... Circuit Schematic - Part Circuit Schematic - Part HV9982 HV9982 10 HV9982DB1 ...

Page 11

... SMD0805 100kΩ, 1/10W, 1% chip resistor SMD0603 SPDT Gull Wing slide switch SMT Three-channel closed-loop QFN-40 LED Driver 6.176MHz fi xed frequency SMT oscillator (optional) 11 HV9982DB1 Manufacturer Manufacturer’s Part # Keystone 5016 Electronics Murata GRM31CR71H225KA88L EPCOS Inc B32521C1334J Taiyo Yuden EMK107BJ105KA-TR ...